The main issue investors hope to get more insight on is what the explosion of mobile devices such as Apple's iPhone and iPad tablet--along with searches and search ads on them--will mean for Google's business. The company's stock plunged in January when Google reported lower-than-expected fourth-quarter profits. That was largely blamed on lower click prices that many analysts attributed to rapidly increasing queries on mobile devices, where ads bring in much less money than ads on computers.

Other questions for which investors will be looking for answers (though with Google's customary lack of guidance, it's doubtful they will get all the answers they want):

* Whither Android, Google's mobile operating system? Rumors recently point to Google releasing its own tablet. That's adding to concerns by hardware partners--already fueled by the Motorola acquisition--that Google is competing with the device makers it expects to use Android, the spread of which it hopes will keep its ad business humming.

* How is Google's drive to get more display ads, particularly video ads on its YouTube property, faring? Google has said display ad revenues are growing quickly, but it's not clear mainly where--on Google.com, YouTube, mobile, or what?

* Speaking of YouTube, are recent deals with studios for mainstream movies and TV shows paying off yet?

* What else will Larry dump? In particular, will Google keep investing in Google Apps, its office productivity software in the cloud? The group producing that software in competition with Microsoft and others has seen some high-profile departures recently, hinting that Google could be deemphasizing the services.